Stuart McDonald: I am very grateful to the Liberal Democrat leader for giving way. Given that he has pressed so hard for the Government to take more refugees, why is he content to bomb that country when the Prime Minister has refused to give that assurance? This is ridiculous.

Andrew Tyrie: Intervention will succeed only if it is part of a coherent military strategy and a coherent political strategy. Both are needed. I have yet to hear them in the statements from Ministers, although I very much want to hear them.
	First, on the military strategy, degrading ISIL’s capacity from the air will achieve little unless it is followed by effective use of ground forces. But President Obama has ruled out committing ground troops, as has the Prime Minister, so the question of where those troops are going to come from is paramount. The Prime Minister appears to be insisting that Assad, who still has significant forces in theatre, has no part in the future of Syria. In that case, the ground war rests largely with the Kurds, who are less well organised than they are in Iraq, and on the reported 70,000 non-extremist fighters, but the reality of those seems to have faded somewhat in recent days.
	Secondly, and even more important, there is the political strategy. Before military action can be justified, we need to have arrived at the point where the main intervening powers are agreed at least about the broad outlines of a settlement. But that is not evident either. In fact, the military action that has recently been taking place in Syria vividly illustrates the absence of a strategy. A handful of outside powers are attacking or assisting a patchwork of different opponents, some of whom are fighting each other. The political objectives of the western powers and current military action to further them and the political objectives of the Russians are contradictory. The Russians have attacked the groups that the west sees as the potential salvation of Syria. The US and France want to remove the regime that the Russians have been seeking to entrench.
	For military action to have a reasonable prospect of succeeding, we will need agreement among the major powers about the use and objectives of air power, about whom we are and are not targeting, about how the boots on the ground will get there, and about whose boots they will be.